Chaeles kellogg



@uitrit gisten datent @ffice Letters'Patent No. 74,376, dated February11,'1868.

IMPROVED APPARATUS IB. BORING LINKS.

@in rlgrhnle refont in in tigrsr ttrttcrs @anni :mt making intl rf tige time.

TO lALL4 WHOM IT MAY CONOERN: 4

.Be it known that I, CHARLES KELLOGG, ofDetroit, in the county of Wayne, and' State of Michigan, have invented a. new and improved Plate for Boring Links or Eyes; andI do herebyl declare that thefollowing is a full, clear, and `exact description thereof, which ,will enable those skilled' in the art to make and use the same, reference being'badM to the accompanying drawings, forming part of this specification;4

" Figures land 2 are plan'views of the pate, with a link in its proper position for boring.

Figure is a transverse vertical section of the plate and link, through the line z 2:, iig.' 1. Figure .4is a view of the boring-tool. v u Similar letters of reference indicate correspondingparts.` v This invention relates tothe boring or.-reau1ing of theilinks or eye-rods lised in bridges and other structures, when the distances between the centres'ot` the two eyes of such links or rods require to beexactly equal "to some distance taken as a standard, so that the links or rods so bored or roamed shall not vary one with another by any appreciable difference.

It consists of a plate, having at one'end an adjustable end-rest for the eye or link being bored or reamed,

and at the other a standard-stud, projecting vertically from the plate, and upon whih stud is placed the rst bored eye of each link or rod, while the second is being boredor teamed. The second eye will then betwithin and upon the adjusted end-rest. The lower end of the boring or reaming-tool is reduced somewhat, and works with smoothlyinished contact in a steel-hushed hole in the plate, the said hole being under the eye to be fitted.'

When one eye of a link or redis bored'orreamed, it is placed on the standard-stud, the said link or rod then resting longitudinally on the plate which brings the rough eye under the boring-tool, whereby the secured eye is bored at the exactsta'ndard distance from the other, as will hereafter be more fully and specially set forth.

In the drawings, A is the plate, cast in one continuous piece, for a purpose to be shown. Bis the end-rest, formed with a.re-enter'ing angle, or other equivalent profile, for the purpose of receiving and holding firmly the eye or 'end of a rodor link while the same is being bored. This angular or concave prole is formed with a shoulder or step, shwn at a, and upon this shoulder the end of the link or4 eye rests while-being bored. Side mouldings, Meest on the plate A, serve as guides to the end-rest v13, when the latter is moved for adjustment. They also assist the screw-bolts d in holding the said end1est firmly at any desired point. `Thesescrew-bolts pass `through slots e in the rest B', as shown, and these slots are for the purpose1of permittingtbe adjustment ofthe end-rest to the link or eye to be borcdvor roamed.l D is the standard-stud, and may be east on the plate and finished upsmoothly, or it may be turned o in a lathe, and tapped into the plate at any point in line with the steel-hushed bearing-step n. D is merely another standard-stud, for ashorter link or-jeye, and has no reference to thevstud D, when the latter is being used. Its presence simply serves to show thatone or more of such stud-s may be castV or formed on the saine plate to suit dill'erent lengths of links, but, when `the eyes of-rods' are being bored., there coul-fl he no such intervening studs on the plate. At'the base of the standard-stud is al collar or shoulder, as shown atm, which is of the same height as the step a of the endrest, whereby the link or rod is held parallel to the plane of theplate, er at right angles to the axis ot' the boring-tool, whiehis perpendicular to the said plane, The boring-tool is shown at E, fig. 4, and is formed with a reduced end, r, fitting with finished contact iu the hole n, which latter is provided with a steel bushngfz', for the purpose of preventA ing the slightest vibration or deviation of the boring-tool upon the position which it is to occupy when boring the eyes or link s of each and every one of the whole number to be made accurately equal as to the distances y apart of the eyes or endcentres of the links, as before mentioned. Thelserrated form of the cutting-partof the boring-tool is shown at M, and it may befformed in other dill'erent suitable patterns, nothing' being claimed in such form. The shank N of the. tool is connected with the driving-power by any suitablemeans which peimitsthe raising of the tool sufliciently to place the eye or link in position, as shown. is a link in its two positions, When'being bored, which operation of boring will'now be described. I i

v The links, after having been formed with their end curves and lengths approximating as closely` to the required standard as maybe desired, are thenready for being borediout to the exact vstandard length of centres. The end-rest is then adjusted to` bring the endecurve of. the link,when resting therein, centrally over the hole n,

With the linkv against' and outside of the standardstud,rbut resting on the shoulder, m, of the same, as shown at iig. 2. rlhe boring-tool descends, its end, 71 entering the hole n beforev the cutting-part M encounters the link. When the first end is bored through, it is placed on the standard-stud, which itfwill exactly fit. It is then clamped by the button lc, in the position shown at figs. 1 and 3, and when this end-'rs bored also, the operation is y completed, to'be repeated with any link requiring to be brought to the standard distance of centres.

The operation for boring the terminal eyes of rods is identical with that above described. Thus the operation of boring out any nurnber of links or eyes to a certain standard, as before said, is,by means ofimy invention, performed rapidly and with uniform and unerring results. It has also the important advantageous feature of simplicity, and requires only the attendance, ordinarily, of one person, who can be taught byv a few precepts to attend the operation properly, thereby dispensing with expensive slkilledflabor.

The plate A being of one continuous piece, the expansion of it, due to any change in temperature from day to day, will be compensated by the proportionate expansion of the links or rods, whereby the same will be triade all of equal standard length-as to the distance between the bored centres.

'lhis invention, though generally applicable to any purpose answering to the conditions above setforth, is particularly designed for boring out the links and eye-rods entering into the construction of truss and other bridges, where thc thrust of the same is sustained by systems of links or eye-rods arranged parallel' to each other, and ttcd on the same transverse bolts or rods in the chord of the bridge. Anyappreciable dierence in the lengths of suoli rods or links would render the bridge more or less defective and unsafe, from the unequal strain sustained by .the said linltsourods. This exactness of length is frequent-ly soimperatively necessary that anylink er rod differing from the standard by thc one hundredth part of an inch would have to be rejected.

My improvements providea machine vwhich has, by repeated practical tests, been proven to accomplish the end desired to within the one-hundredth partei' an inch. It isA easily constructed, and is a valuable engineering appliance.

Having thus described my invention, I claim as new, and desire to secure by Letters Patent- The plate A,-bea'ring a standard-stuch-D, and provided with an adjustable end-rest, B, or its equivalent, and hole 71., all substantially as shown and described, and for the purpose specified.

CHAS. KELLOGG.

Wi tn csses E. R. BLACKWELL, ADoLrnUs BonzANo. 

